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Leases - Additional Information (Detail)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
m²
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
m²
Sep. 30, 2024
USD ($)
Lessee Lease Description [Line Items]        
Short-term lease expenses | $ $ 17,000 $ 19,000 $ 49,000 $ 54,000
Right-of-use assets | $ 1,300,000   1,300,000  
Operating lease, liability | $ 1,165,000   1,165,000  
Operating lease expense | $ 200,000 $ 300,000 600,000 $ 500,000
Security deposits | $ $ 300,000   $ 300,000  
Combined square meter area for manufacturing facilities under lease | m² 66,559   66,559  
Land use rights, net assets | $ $ 1,400,000   $ 1,400,000  
Beijing [Member]        
Lessee Lease Description [Line Items]        
Square meter area for office space under lease | m² 2,130   2,130  
Square meter area for staff dormitory under lease | m² 249   249  
Lease expiration month and year     2027-06  
Staff dormitory lease expiration month and year     2028-03  
Zhengzhou [Member]        
Lessee Lease Description [Line Items]        
Square meter area for laboratory center under lease | m² 180   180  
Lease expiration month and year     2026-08  
Shanghai [Member]        
Lessee Lease Description [Line Items]        
Square meter area for laboratory center under lease | m² 224   224  
Lease expiration month and year     2026-12  
Nanjing [Member]        
Lessee Lease Description [Line Items]        
Square meter area for laboratory center under lease | m² 70   70  
California [Member]        
Lessee Lease Description [Line Items]        
Lease expiration month and year     2027-03